Finding the Fourth Proportional to 85,499,403.20, 128,333,085.60 and 42,417,252.80

Step by Step Solution

1. Step 1: Write the proportion equation
   85,499,403.20 : 128,333,085.60 = 42,417,252.80 : x
2. Step 2: Convert to fraction form
   85,499,403.20/128,333,085.60 = 42,417,252.80/x
3. Step 3: Cross multiply
   85,499,403.20x = 128,333,085.60 × 42,417,252.80
4. Step 4: Simplify right side
   85,499,403.20x = 5,443,536,934,499,239
5. Step 5: Solve for x
   x = 5,443,536,934,499,239/85,499,403.20
6. Step 6: Final answer
   x = 63,667,543.06