Finding the Fourth Proportional to 78,128.77, 117,158.11 and 46,553.71

Step by Step Solution

1. Step 1: Write the proportion equation
   78,128.77 : 117,158.11 = 46,553.71 : x
2. Step 2: Convert to fraction form
   78,128.77/117,158.11 = 46,553.71/x
3. Step 3: Cross multiply
   78,128.77x = 117,158.11 × 46,553.71
4. Step 4: Simplify right side
   78,128.77x = 5,454,144,677.09
5. Step 5: Solve for x
   x = 5,454,144,677.09/78,128.77
6. Step 6: Final answer
   x = 69,809.68