Finding the Fourth Proportional to 78,142.78, 117,200.16 and 21,969.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78,142.78 : 117,200.16 = 21,969.42 : x
2. Step 2: Convert to fraction form
   78,142.78/117,200.16 = 21,969.42/x
3. Step 3: Cross multiply
   78,142.78x = 117,200.16 × 21,969.42
4. Step 4: Simplify right side
   78,142.78x = 2,574,819,539.11
5. Step 5: Solve for x
   x = 2,574,819,539.11/78,142.78
6. Step 6: Final answer
   x = 32,950.19