Finding the Fourth Proportional to 78,123.30, 116,498.94 and 77,412.87

Step by Step Solution

1. Step 1: Write the proportion equation
   78,123.30 : 116,498.94 = 77,412.87 : x
2. Step 2: Convert to fraction form
   78,123.30/116,498.94 = 77,412.87/x
3. Step 3: Cross multiply
   78,123.30x = 116,498.94 × 77,412.87
4. Step 4: Simplify right side
   78,123.30x = 9,018,517,297.36
5. Step 5: Solve for x
   x = 9,018,517,297.36/78,123.30
6. Step 6: Final answer
   x = 115,439.53