Finding the Fourth Proportional to 1,370.00, 1,890.59 and 780.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,370.00 : 1,890.59 = 780.53 : x
2. Step 2: Convert to fraction form
   1,370.00/1,890.59 = 780.53/x
3. Step 3: Cross multiply
   1,370.00x = 1,890.59 × 780.53
4. Step 4: Simplify right side
   1,370.00x = 1,475,648.86
5. Step 5: Solve for x
   x = 1,475,648.86/1,370.00
6. Step 6: Final answer
   x = 1,077.12