Finding the Fourth Proportional to 77,320.50, 106,696.90 and 42,864.89

Step by Step Solution

1. Step 1: Write the proportion equation
   77,320.50 : 106,696.90 = 42,864.89 : x
2. Step 2: Convert to fraction form
   77,320.50/106,696.90 = 42,864.89/x
3. Step 3: Cross multiply
   77,320.50x = 106,696.90 × 42,864.89
4. Step 4: Simplify right side
   77,320.50x = 4,573,550,360.88
5. Step 5: Solve for x
   x = 4,573,550,360.88/77,320.50
6. Step 6: Final answer
   x = 59,150.56