Finding the Fourth Proportional to 128,383.52, 177,185.76 and 71,798

Step by Step Solution

1. Step 1: Write the proportion equation
   128,383.52 : 177,185.76 = 71,798 : x
2. Step 2: Convert to fraction form
   128,383.52/177,185.76 = 71,798/x
3. Step 3: Cross multiply
   128,383.52x = 177,185.76 × 71,798
4. Step 4: Simplify right side
   128,383.52x = 12,721,583,196.48
5. Step 5: Solve for x
   x = 12,721,583,196.48/128,383.52
6. Step 6: Final answer
   x = 99,090.47