Finding the Fourth Proportional to 89,392.60, 134,118.03 and 42,639.40

Step by Step Solution

1. Step 1: Write the proportion equation
   89,392.60 : 134,118.03 = 42,639.40 : x
2. Step 2: Convert to fraction form
   89,392.60/134,118.03 = 42,639.40/x
3. Step 3: Cross multiply
   89,392.60x = 134,118.03 × 42,639.40
4. Step 4: Simplify right side
   89,392.60x = 5,718,712,328.38
5. Step 5: Solve for x
   x = 5,718,712,328.38/89,392.60
6. Step 6: Final answer
   x = 63,972.99