Finding the Fourth Proportional to 22,385.06, 30,890.42 and 12,312.86

Step by Step Solution

1. Step 1: Write the proportion equation
   22,385.06 : 30,890.42 = 12,312.86 : x
2. Step 2: Convert to fraction form
   22,385.06/30,890.42 = 12,312.86/x
3. Step 3: Cross multiply
   22,385.06x = 30,890.42 × 12,312.86
4. Step 4: Simplify right side
   22,385.06x = 380,349,200.78
5. Step 5: Solve for x
   x = 380,349,200.78/22,385.06
6. Step 6: Final answer
   x = 16,991.21