Finding the Fourth Proportional to 103,013.86, 142,147.38 and 57,685.54

Step by Step Solution

1. Step 1: Write the proportion equation
   103,013.86 : 142,147.38 = 57,685.54 : x
2. Step 2: Convert to fraction form
   103,013.86/142,147.38 = 57,685.54/x
3. Step 3: Cross multiply
   103,013.86x = 142,147.38 × 57,685.54
4. Step 4: Simplify right side
   103,013.86x = 8,199,848,374.89
5. Step 5: Solve for x
   x = 8,199,848,374.89/103,013.86
6. Step 6: Final answer
   x = 79,599.47