Finding the Fourth Proportional to 102,987.72, 142,123.41 and 57,667.68

Step by Step Solution

1. Step 1: Write the proportion equation
   102,987.72 : 142,123.41 = 57,667.68 : x
2. Step 2: Convert to fraction form
   102,987.72/142,123.41 = 57,667.68/x
3. Step 3: Cross multiply
   102,987.72x = 142,123.41 × 57,667.68
4. Step 4: Simplify right side
   102,987.72x = 8,195,927,328.39
5. Step 5: Solve for x
   x = 8,195,927,328.39/102,987.72
6. Step 6: Final answer
   x = 79,581.60