Finding the Fourth Proportional to 368,445.76, 552,493.46 and 128,530.50

Step by Step Solution

1. Step 1: Write the proportion equation
   368,445.76 : 552,493.46 = 128,530.50 : x
2. Step 2: Convert to fraction form
   368,445.76/552,493.46 = 128,530.50/x
3. Step 3: Cross multiply
   368,445.76x = 552,493.46 × 128,530.50
4. Step 4: Simplify right side
   368,445.76x = 71,012,258,187.02
5. Step 5: Solve for x
   x = 71,012,258,187.02/368,445.76
6. Step 6: Final answer
   x = 192,734.63