Finding the Fourth Proportional to 112,689.47, 168,785.05 and 77,066.37

Step by Step Solution

1. Step 1: Write the proportion equation
   112,689.47 : 168,785.05 = 77,066.37 : x
2. Step 2: Convert to fraction form
   112,689.47/168,785.05 = 77,066.37/x
3. Step 3: Cross multiply
   112,689.47x = 168,785.05 × 77,066.37
4. Step 4: Simplify right side
   112,689.47x = 13,007,649,884.51
5. Step 5: Solve for x
   x = 13,007,649,884.51/112,689.47
6. Step 6: Final answer
   x = 115,429.15