Finding the Fourth Proportional to 9,405.60, 12,981.42 and 5,426.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,405.60 : 12,981.42 = 5,426.16 : x
2. Step 2: Convert to fraction form
   9,405.60/12,981.42 = 5,426.16/x
3. Step 3: Cross multiply
   9,405.60x = 12,981.42 × 5,426.16
4. Step 4: Simplify right side
   9,405.60x = 70,439,261.95
5. Step 5: Solve for x
   x = 70,439,261.95/9,405.60
6. Step 6: Final answer
   x = 7,489.08