Finding the Fourth Proportional to 90,855, 136,283.72 and 28,525.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,855 : 136,283.72 = 28,525.50 : x
2. Step 2: Convert to fraction form
   90,855/136,283.72 = 28,525.50/x
3. Step 3: Cross multiply
   90,855x = 136,283.72 × 28,525.50
4. Step 4: Simplify right side
   90,855x = 3,887,561,112.23
5. Step 5: Solve for x
   x = 3,887,561,112.23/90,855
6. Step 6: Final answer
   x = 42,788.63