Finding the Fourth Proportional to 77,499.57, 106,921.89 and 50,657.58

Step by Step Solution

1. Step 1: Write the proportion equation
   77,499.57 : 106,921.89 = 50,657.58 : x
2. Step 2: Convert to fraction form
   77,499.57/106,921.89 = 50,657.58/x
3. Step 3: Cross multiply
   77,499.57x = 106,921.89 × 50,657.58
4. Step 4: Simplify right side
   77,499.57x = 5,416,404,196.43
5. Step 5: Solve for x
   x = 5,416,404,196.43/77,499.57
6. Step 6: Final answer
   x = 69,889.47