Finding the Fourth Proportional to 78,042.53, 117,027.28 and 28,116.05

Step by Step Solution

1. Step 1: Write the proportion equation
   78,042.53 : 117,027.28 = 28,116.05 : x
2. Step 2: Convert to fraction form
   78,042.53/117,027.28 = 28,116.05/x
3. Step 3: Cross multiply
   78,042.53x = 117,027.28 × 28,116.05
4. Step 4: Simplify right side
   78,042.53x = 3,290,344,799.56
5. Step 5: Solve for x
   x = 3,290,344,799.56/78,042.53
6. Step 6: Final answer
   x = 42,160.92