Finding the Fourth Proportional to 57,990, 79,426.57 and 54,585.56

Step by Step Solution

1. Step 1: Write the proportion equation
   57,990 : 79,426.57 = 54,585.56 : x
2. Step 2: Convert to fraction form
   57,990/79,426.57 = 54,585.56/x
3. Step 3: Cross multiply
   57,990x = 79,426.57 × 54,585.56
4. Step 4: Simplify right side
   57,990x = 4,335,543,802.33
5. Step 5: Solve for x
   x = 4,335,543,802.33/57,990
6. Step 6: Final answer
   x = 74,763.65