Finding the Fourth Proportional to 15,475.89, 21,356.30 and 8,402.31

Step by Step Solution

1. Step 1: Write the proportion equation
   15,475.89 : 21,356.30 = 8,402.31 : x
2. Step 2: Convert to fraction form
   15,475.89/21,356.30 = 8,402.31/x
3. Step 3: Cross multiply
   15,475.89x = 21,356.30 × 8,402.31
4. Step 4: Simplify right side
   15,475.89x = 179,442,211.04
5. Step 5: Solve for x
   x = 179,442,211.04/15,475.89
6. Step 6: Final answer
   x = 11,594.95