Finding the Fourth Proportional to 38,689.31, 58,043.72 and 10,987.31

Step by Step Solution

1. Step 1: Write the proportion equation
   38,689.31 : 58,043.72 = 10,987.31 : x
2. Step 2: Convert to fraction form
   38,689.31/58,043.72 = 10,987.31/x
3. Step 3: Cross multiply
   38,689.31x = 58,043.72 × 10,987.31
4. Step 4: Simplify right side
   38,689.31x = 637,744,517.77
5. Step 5: Solve for x
   x = 637,744,517.77/38,689.31
6. Step 6: Final answer
   x = 16,483.74