Finding the Fourth Proportional to 12,977.01, 17,908.32 and 7,870.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,977.01 : 17,908.32 = 7,870.82 : x
2. Step 2: Convert to fraction form
   12,977.01/17,908.32 = 7,870.82/x
3. Step 3: Cross multiply
   12,977.01x = 17,908.32 × 7,870.82
4. Step 4: Simplify right side
   12,977.01x = 140,953,073.68
5. Step 5: Solve for x
   x = 140,953,073.68/12,977.01
6. Step 6: Final answer
   x = 10,861.75