Finding the Fourth Proportional to 13,731.50, 18,948.42 and 9,261.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,731.50 : 18,948.42 = 9,261.30 : x
2. Step 2: Convert to fraction form
   13,731.50/18,948.42 = 9,261.30/x
3. Step 3: Cross multiply
   13,731.50x = 18,948.42 × 9,261.30
4. Step 4: Simplify right side
   13,731.50x = 175,487,002.15
5. Step 5: Solve for x
   x = 175,487,002.15/13,731.50
6. Step 6: Final answer
   x = 12,779.89