Finding the Fourth Proportional to 8,670.72, 12,980.16 and 5,900.16

Step by Step Solution

1. Step 1: Write the proportion equation
   8,670.72 : 12,980.16 = 5,900.16 : x
2. Step 2: Convert to fraction form
   8,670.72/12,980.16 = 5,900.16/x
3. Step 3: Cross multiply
   8,670.72x = 12,980.16 × 5,900.16
4. Step 4: Simplify right side
   8,670.72x = 76,585,020.83
5. Step 5: Solve for x
   x = 76,585,020.83/8,670.72
6. Step 6: Final answer
   x = 8,832.60