Finding the Fourth Proportional to 105,131.93, 145,079.75 and 57,386.07

Step by Step Solution

1. Step 1: Write the proportion equation
   105,131.93 : 145,079.75 = 57,386.07 : x
2. Step 2: Convert to fraction form
   105,131.93/145,079.75 = 57,386.07/x
3. Step 3: Cross multiply
   105,131.93x = 145,079.75 × 57,386.07
4. Step 4: Simplify right side
   105,131.93x = 8,325,556,402.15
5. Step 5: Solve for x
   x = 8,325,556,402.15/105,131.93
6. Step 6: Final answer
   x = 79,191.51