Finding the Fourth Proportional to 64,673,499.42, 89,022,895.64 and 56,398,963.05

Step by Step Solution

1. Step 1: Write the proportion equation
   64,673,499.42 : 89,022,895.64 = 56,398,963.05 : x
2. Step 2: Convert to fraction form
   64,673,499.42/89,022,895.64 = 56,398,963.05/x
3. Step 3: Cross multiply
   64,673,499.42x = 89,022,895.64 × 56,398,963.05
4. Step 4: Simplify right side
   64,673,499.42x = 5,020,799,001,804,366
5. Step 5: Solve for x
   x = 5,020,799,001,804,366/64,673,499.42
6. Step 6: Final answer
   x = 77,633,018.88