Finding the Fourth Proportional to 1,378.61, 2,054.76 and 1,300.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.61 : 2,054.76 = 1,300.77 : x
2. Step 2: Convert to fraction form
   1,378.61/2,054.76 = 1,300.77/x
3. Step 3: Cross multiply
   1,378.61x = 2,054.76 × 1,300.77
4. Step 4: Simplify right side
   1,378.61x = 2,672,759.89
5. Step 5: Solve for x
   x = 2,672,759.89/1,378.61
6. Step 6: Final answer
   x = 1,938.74