Finding the Fourth Proportional to 64,856.54, 89,488.35 and 39,376.30

Step by Step Solution

1. Step 1: Write the proportion equation
   64,856.54 : 89,488.35 = 39,376.30 : x
2. Step 2: Convert to fraction form
   64,856.54/89,488.35 = 39,376.30/x
3. Step 3: Cross multiply
   64,856.54x = 89,488.35 × 39,376.30
4. Step 4: Simplify right side
   64,856.54x = 3,523,720,116.11
5. Step 5: Solve for x
   x = 3,523,720,116.11/64,856.54
6. Step 6: Final answer
   x = 54,330.99