Finding the Fourth Proportional to 191,406.01, 287,109.12 and 86,101.96

Step by Step Solution

1. Step 1: Write the proportion equation
   191,406.01 : 287,109.12 = 86,101.96 : x
2. Step 2: Convert to fraction form
   191,406.01/287,109.12 = 86,101.96/x
3. Step 3: Cross multiply
   191,406.01x = 287,109.12 × 86,101.96
4. Step 4: Simplify right side
   191,406.01x = 24,720,657,965.88
5. Step 5: Solve for x
   x = 24,720,657,965.88/191,406.01
6. Step 6: Final answer
   x = 129,152.99