Finding the Fourth Proportional to 78,158.71, 117,238.12 and 18,993.98

Step by Step Solution

1. Step 1: Write the proportion equation
   78,158.71 : 117,238.12 = 18,993.98 : x
2. Step 2: Convert to fraction form
   78,158.71/117,238.12 = 18,993.98/x
3. Step 3: Cross multiply
   78,158.71x = 117,238.12 × 18,993.98
4. Step 4: Simplify right side
   78,158.71x = 2,226,818,667.39
5. Step 5: Solve for x
   x = 2,226,818,667.39/78,158.71
6. Step 6: Final answer
   x = 28,490.99