Finding the Fourth Proportional to 90,830.81, 136,268.10 and 28,501.31

Step by Step Solution

1. Step 1: Write the proportion equation
   90,830.81 : 136,268.10 = 28,501.31 : x
2. Step 2: Convert to fraction form
   90,830.81/136,268.10 = 28,501.31/x
3. Step 3: Cross multiply
   90,830.81x = 136,268.10 × 28,501.31
4. Step 4: Simplify right side
   90,830.81x = 3,883,819,701.88
5. Step 5: Solve for x
   x = 3,883,819,701.88/90,830.81
6. Step 6: Final answer
   x = 42,758.83