Finding the Fourth Proportional to 1,899.84, 2,621.52 and 1,113.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,899.84 : 2,621.52 = 1,113.72 : x
2. Step 2: Convert to fraction form
   1,899.84/2,621.52 = 1,113.72/x
3. Step 3: Cross multiply
   1,899.84x = 2,621.52 × 1,113.72
4. Step 4: Simplify right side
   1,899.84x = 2,919,639.25
5. Step 5: Solve for x
   x = 2,919,639.25/1,899.84
6. Step 6: Final answer
   x = 1,536.78