Finding the Fourth Proportional to 1,376.84, 1,899.06 and 911.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.84 : 1,899.06 = 911.72 : x
2. Step 2: Convert to fraction form
   1,376.84/1,899.06 = 911.72/x
3. Step 3: Cross multiply
   1,376.84x = 1,899.06 × 911.72
4. Step 4: Simplify right side
   1,376.84x = 1,731,410.98
5. Step 5: Solve for x
   x = 1,731,410.98/1,376.84
6. Step 6: Final answer
   x = 1,257.53