Finding the Fourth Proportional to 1,899.71, 2,621.58 and 1,113.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,899.71 : 2,621.58 = 1,113.61 : x
2. Step 2: Convert to fraction form
   1,899.71/2,621.58 = 1,113.61/x
3. Step 3: Cross multiply
   1,899.71x = 2,621.58 × 1,113.61
4. Step 4: Simplify right side
   1,899.71x = 2,919,404.60
5. Step 5: Solve for x
   x = 2,919,404.60/1,899.71
6. Step 6: Final answer
   x = 1,536.76