Finding the Fourth Proportional to 191,404.50, 287,109.18 and 66,745.50

Step by Step Solution

1. Step 1: Write the proportion equation
   191,404.50 : 287,109.18 = 66,745.50 : x
2. Step 2: Convert to fraction form
   191,404.50/287,109.18 = 66,745.50/x
3. Step 3: Cross multiply
   191,404.50x = 287,109.18 × 66,745.50
4. Step 4: Simplify right side
   191,404.50x = 19,163,245,773.69
5. Step 5: Solve for x
   x = 19,163,245,773.69/191,404.50
6. Step 6: Final answer
   x = 100,119.10