Finding the Fourth Proportional to 64,792.40, 89,430.21 and 42,187.86

Step by Step Solution

1. Step 1: Write the proportion equation
   64,792.40 : 89,430.21 = 42,187.86 : x
2. Step 2: Convert to fraction form
   64,792.40/89,430.21 = 42,187.86/x
3. Step 3: Cross multiply
   64,792.40x = 89,430.21 × 42,187.86
4. Step 4: Simplify right side
   64,792.40x = 3,772,869,179.25
5. Step 5: Solve for x
   x = 3,772,869,179.25/64,792.40
6. Step 6: Final answer
   x = 58,230.12