Finding the Fourth Proportional to 13,406.27, 18,499.86 and 7,437.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,406.27 : 18,499.86 = 7,437.78 : x
2. Step 2: Convert to fraction form
   13,406.27/18,499.86 = 7,437.78/x
3. Step 3: Cross multiply
   13,406.27x = 18,499.86 × 7,437.78
4. Step 4: Simplify right side
   13,406.27x = 137,597,888.71
5. Step 5: Solve for x
   x = 137,597,888.71/13,406.27
6. Step 6: Final answer
   x = 10,263.70