Finding the Fourth Proportional to 136,145.50, 187,683.83 and 90,128.03

Step by Step Solution

1. Step 1: Write the proportion equation
   136,145.50 : 187,683.83 = 90,128.03 : x
2. Step 2: Convert to fraction form
   136,145.50/187,683.83 = 90,128.03/x
3. Step 3: Cross multiply
   136,145.50x = 187,683.83 × 90,128.03
4. Step 4: Simplify right side
   136,145.50x = 16,915,574,555.28
5. Step 5: Solve for x
   x = 16,915,574,555.28/136,145.50
6. Step 6: Final answer
   x = 124,246.30