Finding the Fourth Proportional to 64,999.17, 89,665.61 and 42,376.05

Step by Step Solution

1. Step 1: Write the proportion equation
   64,999.17 : 89,665.61 = 42,376.05 : x
2. Step 2: Convert to fraction form
   64,999.17/89,665.61 = 42,376.05/x
3. Step 3: Cross multiply
   64,999.17x = 89,665.61 × 42,376.05
4. Step 4: Simplify right side
   64,999.17x = 3,799,674,160.76
5. Step 5: Solve for x
   x = 3,799,674,160.76/64,999.17
6. Step 6: Final answer
   x = 58,457.27