Finding the Fourth Proportional to 12,913.43, 17,820.41 and 7,877.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,913.43 : 17,820.41 = 7,877.32 : x
2. Step 2: Convert to fraction form
   12,913.43/17,820.41 = 7,877.32/x
3. Step 3: Cross multiply
   12,913.43x = 17,820.41 × 7,877.32
4. Step 4: Simplify right side
   12,913.43x = 140,376,988.16
5. Step 5: Solve for x
   x = 140,376,988.16/12,913.43
6. Step 6: Final answer
   x = 10,870.62