Finding the Fourth Proportional to 71,906.69, 107,860.04 and 21,986.78

Step by Step Solution

1. Step 1: Write the proportion equation
   71,906.69 : 107,860.04 = 21,986.78 : x
2. Step 2: Convert to fraction form
   71,906.69/107,860.04 = 21,986.78/x
3. Step 3: Cross multiply
   71,906.69x = 107,860.04 × 21,986.78
4. Step 4: Simplify right side
   71,906.69x = 2,371,495,294.89
5. Step 5: Solve for x
   x = 2,371,495,294.89/71,906.69
6. Step 6: Final answer
   x = 32,980.17