Finding the Fourth Proportional to 13,289.10, 19,909.89 and 7,435.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,289.10 : 19,909.89 = 7,435.50 : x
2. Step 2: Convert to fraction form
   13,289.10/19,909.89 = 7,435.50/x
3. Step 3: Cross multiply
   13,289.10x = 19,909.89 × 7,435.50
4. Step 4: Simplify right side
   13,289.10x = 148,039,987.10
5. Step 5: Solve for x
   x = 148,039,987.10/13,289.10
6. Step 6: Final answer
   x = 11,139.96