Finding the Fourth Proportional to 162,870.21, 244,337.49 and 78,688.89

Step by Step Solution

1. Step 1: Write the proportion equation
   162,870.21 : 244,337.49 = 78,688.89 : x
2. Step 2: Convert to fraction form
   162,870.21/244,337.49 = 78,688.89/x
3. Step 3: Cross multiply
   162,870.21x = 244,337.49 × 78,688.89
4. Step 4: Simplify right side
   162,870.21x = 19,226,645,873.49
5. Step 5: Solve for x
   x = 19,226,645,873.49/162,870.21
6. Step 6: Final answer
   x = 118,048.88