Finding the Fourth Proportional to 40,701.79, 61,070.25 and 21,978.10

Step by Step Solution

1. Step 1: Write the proportion equation
   40,701.79 : 61,070.25 = 21,978.10 : x
2. Step 2: Convert to fraction form
   40,701.79/61,070.25 = 21,978.10/x
3. Step 3: Cross multiply
   40,701.79x = 61,070.25 × 21,978.10
4. Step 4: Simplify right side
   40,701.79x = 1,342,208,061.53
5. Step 5: Solve for x
   x = 1,342,208,061.53/40,701.79
6. Step 6: Final answer
   x = 32,976.63