Finding the Fourth Proportional to 9,414.81, 12,988.73 and 5,435.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,414.81 : 12,988.73 = 5,435.15 : x
2. Step 2: Convert to fraction form
   9,414.81/12,988.73 = 5,435.15/x
3. Step 3: Cross multiply
   9,414.81x = 12,988.73 × 5,435.15
4. Step 4: Simplify right side
   9,414.81x = 70,595,702.28
5. Step 5: Solve for x
   x = 70,595,702.28/9,414.81
6. Step 6: Final answer
   x = 7,498.37