Finding the Fourth Proportional to 89,749.61, 123,832.71 and 50,978.80

Step by Step Solution

1. Step 1: Write the proportion equation
   89,749.61 : 123,832.71 = 50,978.80 : x
2. Step 2: Convert to fraction form
   89,749.61/123,832.71 = 50,978.80/x
3. Step 3: Cross multiply
   89,749.61x = 123,832.71 × 50,978.80
4. Step 4: Simplify right side
   89,749.61x = 6,312,842,956.55
5. Step 5: Solve for x
   x = 6,312,842,956.55/89,749.61
6. Step 6: Final answer
   x = 70,338.39