Finding the Fourth Proportional to 77,662.94, 107,192.57 and 54,978.35

Step by Step Solution

1. Step 1: Write the proportion equation
   77,662.94 : 107,192.57 = 54,978.35 : x
2. Step 2: Convert to fraction form
   77,662.94/107,192.57 = 54,978.35/x
3. Step 3: Cross multiply
   77,662.94x = 107,192.57 × 54,978.35
4. Step 4: Simplify right side
   77,662.94x = 5,893,269,820.00
5. Step 5: Solve for x
   x = 5,893,269,820.00/77,662.94
6. Step 6: Final answer
   x = 75,882.66