Finding the Fourth Proportional to 7,312.50, 10,091.21 and 3,955.31

Step by Step Solution

1. Step 1: Write the proportion equation
   7,312.50 : 10,091.21 = 3,955.31 : x
2. Step 2: Convert to fraction form
   7,312.50/10,091.21 = 3,955.31/x
3. Step 3: Cross multiply
   7,312.50x = 10,091.21 × 3,955.31
4. Step 4: Simplify right side
   7,312.50x = 39,913,863.83
5. Step 5: Solve for x
   x = 39,913,863.83/7,312.50
6. Step 6: Final answer
   x = 5,458.31