Finding the Fourth Proportional to 8,931.90, 12,320.56 and 5,907.02

Step by Step Solution

1. Step 1: Write the proportion equation
   8,931.90 : 12,320.56 = 5,907.02 : x
2. Step 2: Convert to fraction form
   8,931.90/12,320.56 = 5,907.02/x
3. Step 3: Cross multiply
   8,931.90x = 12,320.56 × 5,907.02
4. Step 4: Simplify right side
   8,931.90x = 72,777,794.33
5. Step 5: Solve for x
   x = 72,777,794.33/8,931.90
6. Step 6: Final answer
   x = 8,148.08