Finding the Fourth Proportional to 1,376.06, 1,898.70 and 786.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.06 : 1,898.70 = 786.56 : x
2. Step 2: Convert to fraction form
   1,376.06/1,898.70 = 786.56/x
3. Step 3: Cross multiply
   1,376.06x = 1,898.70 × 786.56
4. Step 4: Simplify right side
   1,376.06x = 1,493,441.47
5. Step 5: Solve for x
   x = 1,493,441.47/1,376.06
6. Step 6: Final answer
   x = 1,085.30