Finding the Fourth Proportional to 1,113.94, 1,536.86 and 641.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.94 : 1,536.86 = 641.82 : x
2. Step 2: Convert to fraction form
   1,113.94/1,536.86 = 641.82/x
3. Step 3: Cross multiply
   1,113.94x = 1,536.86 × 641.82
4. Step 4: Simplify right side
   1,113.94x = 986,386.84
5. Step 5: Solve for x
   x = 986,386.84/1,113.94
6. Step 6: Final answer
   x = 885.50