Finding the Fourth Proportional to 91,336.20, 137,002.38 and 42,088.20

Step by Step Solution

1. Step 1: Write the proportion equation
   91,336.20 : 137,002.38 = 42,088.20 : x
2. Step 2: Convert to fraction form
   91,336.20/137,002.38 = 42,088.20/x
3. Step 3: Cross multiply
   91,336.20x = 137,002.38 × 42,088.20
4. Step 4: Simplify right side
   91,336.20x = 5,766,183,569.92
5. Step 5: Solve for x
   x = 5,766,183,569.92/91,336.20
6. Step 6: Final answer
   x = 63,131.42