Finding the Fourth Proportional to 123,721.80, 185,675.98 and 90,527.50

Step by Step Solution

1. Step 1: Write the proportion equation
   123,721.80 : 185,675.98 = 90,527.50 : x
2. Step 2: Convert to fraction form
   123,721.80/185,675.98 = 90,527.50/x
3. Step 3: Cross multiply
   123,721.80x = 185,675.98 × 90,527.50
4. Step 4: Simplify right side
   123,721.80x = 16,808,782,279.45
5. Step 5: Solve for x
   x = 16,808,782,279.45/123,721.80
6. Step 6: Final answer
   x = 135,859.50