Finding the Fourth Proportional to 1,602.50, 2,211.69 and 981.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,602.50 : 2,211.69 = 981.86 : x
2. Step 2: Convert to fraction form
   1,602.50/2,211.69 = 981.86/x
3. Step 3: Cross multiply
   1,602.50x = 2,211.69 × 981.86
4. Step 4: Simplify right side
   1,602.50x = 2,171,569.94
5. Step 5: Solve for x
   x = 2,171,569.94/1,602.50
6. Step 6: Final answer
   x = 1,355.11