Finding the Fourth Proportional to 21,100.93, 31,642.16 and 10,010.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,100.93 : 31,642.16 = 10,010.78 : x
2. Step 2: Convert to fraction form
   21,100.93/31,642.16 = 10,010.78/x
3. Step 3: Cross multiply
   21,100.93x = 31,642.16 × 10,010.78
4. Step 4: Simplify right side
   21,100.93x = 316,762,806.62
5. Step 5: Solve for x
   x = 316,762,806.62/21,100.93
6. Step 6: Final answer
   x = 15,011.80