Finding the Fourth Proportional to 13,406.15, 18,499.88 and 7,437.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,406.15 : 18,499.88 = 7,437.78 : x
2. Step 2: Convert to fraction form
   13,406.15/18,499.88 = 7,437.78/x
3. Step 3: Cross multiply
   13,406.15x = 18,499.88 × 7,437.78
4. Step 4: Simplify right side
   13,406.15x = 137,598,056.06
5. Step 5: Solve for x
   x = 137,598,056.06/13,406.15
6. Step 6: Final answer
   x = 10,263.80