Finding the Fourth Proportional to 191,410.01, 287,115.12 and 86,105.96

Step by Step Solution

1. Step 1: Write the proportion equation
   191,410.01 : 287,115.12 = 86,105.96 : x
2. Step 2: Convert to fraction form
   191,410.01/287,115.12 = 86,105.96/x
3. Step 3: Cross multiply
   191,410.01x = 287,115.12 × 86,105.96
4. Step 4: Simplify right side
   191,410.01x = 24,722,323,038.12
5. Step 5: Solve for x
   x = 24,722,323,038.12/191,410.01
6. Step 6: Final answer
   x = 129,158.99