Finding the Fourth Proportional to 78,061.68, 117,079.20 and 28,131.84

Step by Step Solution

1. Step 1: Write the proportion equation
   78,061.68 : 117,079.20 = 28,131.84 : x
2. Step 2: Convert to fraction form
   78,061.68/117,079.20 = 28,131.84/x
3. Step 3: Cross multiply
   78,061.68x = 117,079.20 × 28,131.84
4. Step 4: Simplify right side
   78,061.68x = 3,293,653,321.73
5. Step 5: Solve for x
   x = 3,293,653,321.73/78,061.68
6. Step 6: Final answer
   x = 42,192.96