Finding the Fourth Proportional to 136,405.51, 188,317.69 and 91,160.12

Step by Step Solution

1. Step 1: Write the proportion equation
   136,405.51 : 188,317.69 = 91,160.12 : x
2. Step 2: Convert to fraction form
   136,405.51/188,317.69 = 91,160.12/x
3. Step 3: Cross multiply
   136,405.51x = 188,317.69 × 91,160.12
4. Step 4: Simplify right side
   136,405.51x = 17,167,063,461.42
5. Step 5: Solve for x
   x = 17,167,063,461.42/136,405.51
6. Step 6: Final answer
   x = 125,853.15