Finding the Fourth Proportional to 64,875.72, 89,338.98 and 62,144.40

Step by Step Solution

1. Step 1: Write the proportion equation
   64,875.72 : 89,338.98 = 62,144.40 : x
2. Step 2: Convert to fraction form
   64,875.72/89,338.98 = 62,144.40/x
3. Step 3: Cross multiply
   64,875.72x = 89,338.98 × 62,144.40
4. Step 4: Simplify right side
   64,875.72x = 5,551,917,308.71
5. Step 5: Solve for x
   x = 5,551,917,308.71/64,875.72
6. Step 6: Final answer
   x = 85,577.74