Finding the Fourth Proportional to 78,981.96, 118,493.70 and 28,386.09

Step by Step Solution

1. Step 1: Write the proportion equation
   78,981.96 : 118,493.70 = 28,386.09 : x
2. Step 2: Convert to fraction form
   78,981.96/118,493.70 = 28,386.09/x
3. Step 3: Cross multiply
   78,981.96x = 118,493.70 × 28,386.09
4. Step 4: Simplify right side
   78,981.96x = 3,363,572,832.63
5. Step 5: Solve for x
   x = 3,363,572,832.63/78,981.96
6. Step 6: Final answer
   x = 42,586.60