Finding the Fourth Proportional to 1,372.42, 1,893.89 and 783.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.42 : 1,893.89 = 783.15 : x
2. Step 2: Convert to fraction form
   1,372.42/1,893.89 = 783.15/x
3. Step 3: Cross multiply
   1,372.42x = 1,893.89 × 783.15
4. Step 4: Simplify right side
   1,372.42x = 1,483,199.95
5. Step 5: Solve for x
   x = 1,483,199.95/1,372.42
6. Step 6: Final answer
   x = 1,080.72