Finding the Fourth Proportional to 102,389.05, 141,291.91 and 57,071.98

Step by Step Solution

1. Step 1: Write the proportion equation
   102,389.05 : 141,291.91 = 57,071.98 : x
2. Step 2: Convert to fraction form
   102,389.05/141,291.91 = 57,071.98/x
3. Step 3: Cross multiply
   102,389.05x = 141,291.91 × 57,071.98
4. Step 4: Simplify right side
   102,389.05x = 8,063,809,061.68
5. Step 5: Solve for x
   x = 8,063,809,061.68/102,389.05
6. Step 6: Final answer
   x = 78,756.56