Finding the Fourth Proportional to 64,876.72, 89,340.36 and 62,145.40

Step by Step Solution

1. Step 1: Write the proportion equation
   64,876.72 : 89,340.36 = 62,145.40 : x
2. Step 2: Convert to fraction form
   64,876.72/89,340.36 = 62,145.40/x
3. Step 3: Cross multiply
   64,876.72x = 89,340.36 × 62,145.40
4. Step 4: Simplify right side
   64,876.72x = 5,552,092,408.34
5. Step 5: Solve for x
   x = 5,552,092,408.34/64,876.72
6. Step 6: Final answer
   x = 85,579.12