Finding the Fourth Proportional to 9,931.74, 13,705.86 and 5,455.41

Step by Step Solution

1. Step 1: Write the proportion equation
   9,931.74 : 13,705.86 = 5,455.41 : x
2. Step 2: Convert to fraction form
   9,931.74/13,705.86 = 5,455.41/x
3. Step 3: Cross multiply
   9,931.74x = 13,705.86 × 5,455.41
4. Step 4: Simplify right side
   9,931.74x = 74,771,085.70
5. Step 5: Solve for x
   x = 74,771,085.70/9,931.74
6. Step 6: Final answer
   x = 7,528.50