Finding the Fourth Proportional to 78,540.84, 108,386.91 and 42,731.15

Step by Step Solution

1. Step 1: Write the proportion equation
   78,540.84 : 108,386.91 = 42,731.15 : x
2. Step 2: Convert to fraction form
   78,540.84/108,386.91 = 42,731.15/x
3. Step 3: Cross multiply
   78,540.84x = 108,386.91 × 42,731.15
4. Step 4: Simplify right side
   78,540.84x = 4,631,496,767.31
5. Step 5: Solve for x
   x = 4,631,496,767.31/78,540.84
6. Step 6: Final answer
   x = 58,969.28