Finding the Fourth Proportional to 78,061.90, 117,056.34 and 28,135.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78,061.90 : 117,056.34 = 28,135.42 : x
2. Step 2: Convert to fraction form
   78,061.90/117,056.34 = 28,135.42/x
3. Step 3: Cross multiply
   78,061.90x = 117,056.34 × 28,135.42
4. Step 4: Simplify right side
   78,061.90x = 3,293,429,289.56
5. Step 5: Solve for x
   x = 3,293,429,289.56/78,061.90
6. Step 6: Final answer
   x = 42,189.97