Finding the Fourth Proportional to 10,980,499.20, 16,470,748.80 and 8,146,147.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,980,499.20 : 16,470,748.80 = 8,146,147.20 : x
2. Step 2: Convert to fraction form
   10,980,499.20/16,470,748.80 = 8,146,147.20/x
3. Step 3: Cross multiply
   10,980,499.20x = 16,470,748.80 × 8,146,147.20
4. Step 4: Simplify right side
   10,980,499.20x = 134,173,144,219,023.38
5. Step 5: Solve for x
   x = 134,173,144,219,023.38/10,980,499.20
6. Step 6: Final answer
   x = 12,219,220.80