Finding the Fourth Proportional to 3,837.59, 5,748.85 and 1,989.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,837.59 : 5,748.85 = 1,989.91 : x
2. Step 2: Convert to fraction form
   3,837.59/5,748.85 = 1,989.91/x
3. Step 3: Cross multiply
   3,837.59x = 5,748.85 × 1,989.91
4. Step 4: Simplify right side
   3,837.59x = 11,439,703.78
5. Step 5: Solve for x
   x = 11,439,703.78/3,837.59
6. Step 6: Final answer
   x = 2,980.96