Finding the Fourth Proportional to 13,405.86, 18,500.13 and 7,437.60

Step by Step Solution

1. Step 1: Write the proportion equation
   13,405.86 : 18,500.13 = 7,437.60 : x
2. Step 2: Convert to fraction form
   13,405.86/18,500.13 = 7,437.60/x
3. Step 3: Cross multiply
   13,405.86x = 18,500.13 × 7,437.60
4. Step 4: Simplify right side
   13,405.86x = 137,596,566.89
5. Step 5: Solve for x
   x = 137,596,566.89/13,405.86
6. Step 6: Final answer
   x = 10,263.91