Finding the Fourth Proportional to 9,931.47, 13,705.65 and 5,455.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,931.47 : 13,705.65 = 5,455.50 : x
2. Step 2: Convert to fraction form
   9,931.47/13,705.65 = 5,455.50/x
3. Step 3: Cross multiply
   9,931.47x = 13,705.65 × 5,455.50
4. Step 4: Simplify right side
   9,931.47x = 74,771,173.58
5. Step 5: Solve for x
   x = 74,771,173.58/9,931.47
6. Step 6: Final answer
   x = 7,528.71