Finding the Fourth Proportional to 22,939.61, 31,659.05 and 12,870.77

Step by Step Solution

1. Step 1: Write the proportion equation
   22,939.61 : 31,659.05 = 12,870.77 : x
2. Step 2: Convert to fraction form
   22,939.61/31,659.05 = 12,870.77/x
3. Step 3: Cross multiply
   22,939.61x = 31,659.05 × 12,870.77
4. Step 4: Simplify right side
   22,939.61x = 407,476,224.85
5. Step 5: Solve for x
   x = 407,476,224.85/22,939.61
6. Step 6: Final answer
   x = 17,763.00