Finding the Fourth Proportional to 9,878.79, 13,632.31 and 5,402.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,878.79 : 13,632.31 = 5,402.69 : x
2. Step 2: Convert to fraction form
   9,878.79/13,632.31 = 5,402.69/x
3. Step 3: Cross multiply
   9,878.79x = 13,632.31 × 5,402.69
4. Step 4: Simplify right side
   9,878.79x = 73,651,144.91
5. Step 5: Solve for x
   x = 73,651,144.91/9,878.79
6. Step 6: Final answer
   x = 7,455.48