Finding the Fourth Proportional to 1,890.15, 2,607.10 and 1,142.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,890.15 : 2,607.10 = 1,142.81 : x
2. Step 2: Convert to fraction form
   1,890.15/2,607.10 = 1,142.81/x
3. Step 3: Cross multiply
   1,890.15x = 2,607.10 × 1,142.81
4. Step 4: Simplify right side
   1,890.15x = 2,979,419.95
5. Step 5: Solve for x
   x = 2,979,419.95/1,890.15
6. Step 6: Final answer
   x = 1,576.29