Finding the Fourth Proportional to 90,814.10, 136,211.55 and 28,481.30

Step by Step Solution

1. Step 1: Write the proportion equation
   90,814.10 : 136,211.55 = 28,481.30 : x
2. Step 2: Convert to fraction form
   90,814.10/136,211.55 = 28,481.30/x
3. Step 3: Cross multiply
   90,814.10x = 136,211.55 × 28,481.30
4. Step 4: Simplify right side
   90,814.10x = 3,879,482,019.02
5. Step 5: Solve for x
   x = 3,879,482,019.02/90,814.10
6. Step 6: Final answer
   x = 42,718.94