Finding the Fourth Proportional to 5,445.32, 7,507.40 and 3,931.61

Step by Step Solution

1. Step 1: Write the proportion equation
   5,445.32 : 7,507.40 = 3,931.61 : x
2. Step 2: Convert to fraction form
   5,445.32/7,507.40 = 3,931.61/x
3. Step 3: Cross multiply
   5,445.32x = 7,507.40 × 3,931.61
4. Step 4: Simplify right side
   5,445.32x = 29,516,111.72
5. Step 5: Solve for x
   x = 29,516,111.72/5,445.32
6. Step 6: Final answer
   x = 5,420.46