Finding the Fourth Proportional to 13,387.89, 18,475.25 and 7,419.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,387.89 : 18,475.25 = 7,419.50 : x
2. Step 2: Convert to fraction form
   13,387.89/18,475.25 = 7,419.50/x
3. Step 3: Cross multiply
   13,387.89x = 18,475.25 × 7,419.50
4. Step 4: Simplify right side
   13,387.89x = 137,076,987.90
5. Step 5: Solve for x
   x = 137,076,987.90/13,387.89
6. Step 6: Final answer
   x = 10,238.88