Finding the Fourth Proportional to 21,136.72, 31,705.34 and 5,555.92

Step by Step Solution

1. Step 1: Write the proportion equation
   21,136.72 : 31,705.34 = 5,555.92 : x
2. Step 2: Convert to fraction form
   21,136.72/31,705.34 = 5,555.92/x
3. Step 3: Cross multiply
   21,136.72x = 31,705.34 × 5,555.92
4. Step 4: Simplify right side
   21,136.72x = 176,152,332.61
5. Step 5: Solve for x
   x = 176,152,332.61/21,136.72
6. Step 6: Final answer
   x = 8,333.95