Finding the Fourth Proportional to 420,141,128.80, 630,860,499.60 and 229,038,152.80

Step by Step Solution

1. Step 1: Write the proportion equation
   420,141,128.80 : 630,860,499.60 = 229,038,152.80 : x
2. Step 2: Convert to fraction form
   420,141,128.80/630,860,499.60 = 229,038,152.80/x
3. Step 3: Cross multiply
   420,141,128.80x = 630,860,499.60 × 229,038,152.80
4. Step 4: Simplify right side
   420,141,128.80x = 144,491,123,502,869,152
5. Step 5: Solve for x
   x = 144,491,123,502,869,152/420,141,128.80
6. Step 6: Final answer
   x = 343,910,923.25