Finding the Fourth Proportional to 89,392.32, 134,117.64 and 42,639.12

Step by Step Solution

1. Step 1: Write the proportion equation
   89,392.32 : 134,117.64 = 42,639.12 : x
2. Step 2: Convert to fraction form
   89,392.32/134,117.64 = 42,639.12/x
3. Step 3: Cross multiply
   89,392.32x = 134,117.64 × 42,639.12
4. Step 4: Simplify right side
   89,392.32x = 5,718,658,146.08
5. Step 5: Solve for x
   x = 5,718,658,146.08/89,392.32
6. Step 6: Final answer
   x = 63,972.59