Finding the Fourth Proportional to 21,061.19, 31,590.78 and 5,266.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.19 : 31,590.78 = 5,266.32 : x
2. Step 2: Convert to fraction form
   21,061.19/31,590.78 = 5,266.32/x
3. Step 3: Cross multiply
   21,061.19x = 31,590.78 × 5,266.32
4. Step 4: Simplify right side
   21,061.19x = 166,367,156.53
5. Step 5: Solve for x
   x = 166,367,156.53/21,061.19
6. Step 6: Final answer
   x = 7,899.23