Finding the Fourth Proportional to 91,460.15, 137,875.73 and 85,363.89

Step by Step Solution

1. Step 1: Write the proportion equation
   91,460.15 : 137,875.73 = 85,363.89 : x
2. Step 2: Convert to fraction form
   91,460.15/137,875.73 = 85,363.89/x
3. Step 3: Cross multiply
   91,460.15x = 137,875.73 × 85,363.89
4. Step 4: Simplify right side
   91,460.15x = 11,769,608,649.39
5. Step 5: Solve for x
   x = 11,769,608,649.39/91,460.15
6. Step 6: Final answer
   x = 128,685.65