Finding the Fourth Proportional to 191,587.50, 287,635.59 and 163,686.78

Step by Step Solution

1. Step 1: Write the proportion equation
   191,587.50 : 287,635.59 = 163,686.78 : x
2. Step 2: Convert to fraction form
   191,587.50/287,635.59 = 163,686.78/x
3. Step 3: Cross multiply
   191,587.50x = 287,635.59 × 163,686.78
4. Step 4: Simplify right side
   191,587.50x = 47,082,143,540.50
5. Step 5: Solve for x
   x = 47,082,143,540.50/191,587.50
6. Step 6: Final answer
   x = 245,747.47