Finding the Fourth Proportional to 112,429.62, 155,081.54 and 85,513.12

Step by Step Solution

1. Step 1: Write the proportion equation
   112,429.62 : 155,081.54 = 85,513.12 : x
2. Step 2: Convert to fraction form
   112,429.62/155,081.54 = 85,513.12/x
3. Step 3: Cross multiply
   112,429.62x = 155,081.54 × 85,513.12
4. Step 4: Simplify right side
   112,429.62x = 13,261,505,684.87
5. Step 5: Solve for x
   x = 13,261,505,684.87/112,429.62
6. Step 6: Final answer
   x = 117,953.84