Finding the Fourth Proportional to 1,935.56, 2,901.72 and 780.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,935.56 : 2,901.72 = 780.50 : x
2. Step 2: Convert to fraction form
   1,935.56/2,901.72 = 780.50/x
3. Step 3: Cross multiply
   1,935.56x = 2,901.72 × 780.50
4. Step 4: Simplify right side
   1,935.56x = 2,264,792.46
5. Step 5: Solve for x
   x = 2,264,792.46/1,935.56
6. Step 6: Final answer
   x = 1,170.10