Finding the Fourth Proportional to 165,445.90, 248,145.42 and 53,111.33

Step by Step Solution

1. Step 1: Write the proportion equation
   165,445.90 : 248,145.42 = 53,111.33 : x
2. Step 2: Convert to fraction form
   165,445.90/248,145.42 = 53,111.33/x
3. Step 3: Cross multiply
   165,445.90x = 248,145.42 × 53,111.33
4. Step 4: Simplify right side
   165,445.90x = 13,179,333,289.61
5. Step 5: Solve for x
   x = 13,179,333,289.61/165,445.90
6. Step 6: Final answer
   x = 79,659.47