Finding the Fourth Proportional to 21,210.40, 31,816.86 and 5,627.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,210.40 : 31,816.86 = 5,627.98 : x
2. Step 2: Convert to fraction form
   21,210.40/31,816.86 = 5,627.98/x
3. Step 3: Cross multiply
   21,210.40x = 31,816.86 × 5,627.98
4. Step 4: Simplify right side
   21,210.40x = 179,064,651.74
5. Step 5: Solve for x
   x = 179,064,651.74/21,210.40
6. Step 6: Final answer
   x = 8,442.30