Finding the Fourth Proportional to 103,131.51, 142,328.06 and 57,809.51

Step by Step Solution

1. Step 1: Write the proportion equation
   103,131.51 : 142,328.06 = 57,809.51 : x
2. Step 2: Convert to fraction form
   103,131.51/142,328.06 = 57,809.51/x
3. Step 3: Cross multiply
   103,131.51x = 142,328.06 × 57,809.51
4. Step 4: Simplify right side
   103,131.51x = 8,227,915,407.85
5. Step 5: Solve for x
   x = 8,227,915,407.85/103,131.51
6. Step 6: Final answer
   x = 79,780.81