Finding the Fourth Proportional to 85,840,111.30, 128,768,040.15 and 28,332,508.90

Step by Step Solution

1. Step 1: Write the proportion equation
   85,840,111.30 : 128,768,040.15 = 28,332,508.90 : x
2. Step 2: Convert to fraction form
   85,840,111.30/128,768,040.15 = 28,332,508.90/x
3. Step 3: Cross multiply
   85,840,111.30x = 128,768,040.15 × 28,332,508.90
4. Step 4: Simplify right side
   85,840,111.30x = 3,648,321,643,585,432.50
5. Step 5: Solve for x
   x = 3,648,321,643,585,432.50/85,840,111.30
6. Step 6: Final answer
   x = 42,501,361.99