Finding the Fourth Proportional to 77,949.48, 107,570.34 and 42,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   77,949.48 : 107,570.34 = 42,139.50 : x
2. Step 2: Convert to fraction form
   77,949.48/107,570.34 = 42,139.50/x
3. Step 3: Cross multiply
   77,949.48x = 107,570.34 × 42,139.50
4. Step 4: Simplify right side
   77,949.48x = 4,532,960,342.43
5. Step 5: Solve for x
   x = 4,532,960,342.43/77,949.48
6. Step 6: Final answer
   x = 58,152.54