Finding the Fourth Proportional to 90,085.86, 135,131.58 and 30,920.76

Step by Step Solution

1. Step 1: Write the proportion equation
   90,085.86 : 135,131.58 = 30,920.76 : x
2. Step 2: Convert to fraction form
   90,085.86/135,131.58 = 30,920.76/x
3. Step 3: Cross multiply
   90,085.86x = 135,131.58 × 30,920.76
4. Step 4: Simplify right side
   90,085.86x = 4,178,371,153.60
5. Step 5: Solve for x
   x = 4,178,371,153.60/90,085.86
6. Step 6: Final answer
   x = 46,382.10