Finding the Fourth Proportional to 1,415.61, 1,953.31 and 891.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,415.61 : 1,953.31 = 891.27 : x
2. Step 2: Convert to fraction form
   1,415.61/1,953.31 = 891.27/x
3. Step 3: Cross multiply
   1,415.61x = 1,953.31 × 891.27
4. Step 4: Simplify right side
   1,415.61x = 1,740,926.60
5. Step 5: Solve for x
   x = 1,740,926.60/1,415.61
6. Step 6: Final answer
   x = 1,229.81