Finding the Fourth Proportional to 103,003.86, 142,145.31 and 57,066.51

Step by Step Solution

1. Step 1: Write the proportion equation
   103,003.86 : 142,145.31 = 57,066.51 : x
2. Step 2: Convert to fraction form
   103,003.86/142,145.31 = 57,066.51/x
3. Step 3: Cross multiply
   103,003.86x = 142,145.31 × 57,066.51
4. Step 4: Simplify right side
   103,003.86x = 8,111,736,754.57
5. Step 5: Solve for x
   x = 8,111,736,754.57/103,003.86
6. Step 6: Final answer
   x = 78,751.77