Finding the Fourth Proportional to 102,019.77, 140,784.48 and 56,696.63

Step by Step Solution

1. Step 1: Write the proportion equation
   102,019.77 : 140,784.48 = 56,696.63 : x
2. Step 2: Convert to fraction form
   102,019.77/140,784.48 = 56,696.63/x
3. Step 3: Cross multiply
   102,019.77x = 140,784.48 × 56,696.63
4. Step 4: Simplify right side
   102,019.77x = 7,982,004,868.38
5. Step 5: Solve for x
   x = 7,982,004,868.38/102,019.77
6. Step 6: Final answer
   x = 78,239.78