Finding the Fourth Proportional to 128,897.40, 193,355.31 and 53,942.07

Step by Step Solution

1. Step 1: Write the proportion equation
   128,897.40 : 193,355.31 = 53,942.07 : x
2. Step 2: Convert to fraction form
   128,897.40/193,355.31 = 53,942.07/x
3. Step 3: Cross multiply
   128,897.40x = 193,355.31 × 53,942.07
4. Step 4: Simplify right side
   128,897.40x = 10,429,985,666.89
5. Step 5: Solve for x
   x = 10,429,985,666.89/128,897.40
6. Step 6: Final answer
   x = 80,916.96