Finding the Fourth Proportional to 1,851.78, 2,774.48 and 972.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,851.78 : 2,774.48 = 972.98 : x
2. Step 2: Convert to fraction form
   1,851.78/2,774.48 = 972.98/x
3. Step 3: Cross multiply
   1,851.78x = 2,774.48 × 972.98
4. Step 4: Simplify right side
   1,851.78x = 2,699,505.22
5. Step 5: Solve for x
   x = 2,699,505.22/1,851.78
6. Step 6: Final answer
   x = 1,457.79