Finding the Fourth Proportional to 12,856.87, 17,744.12 and 7,191.93

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856.87 : 17,744.12 = 7,191.93 : x
2. Step 2: Convert to fraction form
   12,856.87/17,744.12 = 7,191.93/x
3. Step 3: Cross multiply
   12,856.87x = 17,744.12 × 7,191.93
4. Step 4: Simplify right side
   12,856.87x = 127,614,468.95
5. Step 5: Solve for x
   x = 127,614,468.95/12,856.87
6. Step 6: Final answer
   x = 9,925.78