Finding the Fourth Proportional to 90,868.16, 136,323.82 and 28,538.68

Step by Step Solution

1. Step 1: Write the proportion equation
   90,868.16 : 136,323.82 = 28,538.68 : x
2. Step 2: Convert to fraction form
   90,868.16/136,323.82 = 28,538.68/x
3. Step 3: Cross multiply
   90,868.16x = 136,323.82 × 28,538.68
4. Step 4: Simplify right side
   90,868.16x = 3,890,501,875.36
5. Step 5: Solve for x
   x = 3,890,501,875.36/90,868.16
6. Step 6: Final answer
   x = 42,814.80