Finding the Fourth Proportional to 64,663.43, 89,184.98 and 42,009.72

Step by Step Solution

1. Step 1: Write the proportion equation
   64,663.43 : 89,184.98 = 42,009.72 : x
2. Step 2: Convert to fraction form
   64,663.43/89,184.98 = 42,009.72/x
3. Step 3: Cross multiply
   64,663.43x = 89,184.98 × 42,009.72
4. Step 4: Simplify right side
   64,663.43x = 3,746,635,932.98
5. Step 5: Solve for x
   x = 3,746,635,932.98/64,663.43
6. Step 6: Final answer
   x = 57,940.57