Finding the Fourth Proportional to 12,870.52, 19,292.55 and 7,311.99

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.52 : 19,292.55 = 7,311.99 : x
2. Step 2: Convert to fraction form
   12,870.52/19,292.55 = 7,311.99/x
3. Step 3: Cross multiply
   12,870.52x = 19,292.55 × 7,311.99
4. Step 4: Simplify right side
   12,870.52x = 141,066,932.67
5. Step 5: Solve for x
   x = 141,066,932.67/12,870.52
6. Step 6: Final answer
   x = 10,960.47