Finding the Fourth Proportional to 82,777.28, 124,196.16 and 51,638.72

Step by Step Solution

1. Step 1: Write the proportion equation
   82,777.28 : 124,196.16 = 51,638.72 : x
2. Step 2: Convert to fraction form
   82,777.28/124,196.16 = 51,638.72/x
3. Step 3: Cross multiply
   82,777.28x = 124,196.16 × 51,638.72
4. Step 4: Simplify right side
   82,777.28x = 6,413,330,731.32
5. Step 5: Solve for x
   x = 6,413,330,731.32/82,777.28
6. Step 6: Final answer
   x = 77,476.94