Finding the Fourth Proportional to 10,121.31, 13,967.48 and 5,645.35

Step by Step Solution

1. Step 1: Write the proportion equation
   10,121.31 : 13,967.48 = 5,645.35 : x
2. Step 2: Convert to fraction form
   10,121.31/13,967.48 = 5,645.35/x
3. Step 3: Cross multiply
   10,121.31x = 13,967.48 × 5,645.35
4. Step 4: Simplify right side
   10,121.31x = 78,851,344.79
5. Step 5: Solve for x
   x = 78,851,344.79/10,121.31
6. Step 6: Final answer
   x = 7,790.63