Finding the Fourth Proportional to 33,290.77, 49,961.72 and 13,585.90

Step by Step Solution

1. Step 1: Write the proportion equation
   33,290.77 : 49,961.72 = 13,585.90 : x
2. Step 2: Convert to fraction form
   33,290.77/49,961.72 = 13,585.90/x
3. Step 3: Cross multiply
   33,290.77x = 49,961.72 × 13,585.90
4. Step 4: Simplify right side
   33,290.77x = 678,774,931.75
5. Step 5: Solve for x
   x = 678,774,931.75/33,290.77
6. Step 6: Final answer
   x = 20,389.28