Finding the Fourth Proportional to 78,780.42, 108,717.32 and 42,971.20

Step by Step Solution

1. Step 1: Write the proportion equation
   78,780.42 : 108,717.32 = 42,971.20 : x
2. Step 2: Convert to fraction form
   78,780.42/108,717.32 = 42,971.20/x
3. Step 3: Cross multiply
   78,780.42x = 108,717.32 × 42,971.20
4. Step 4: Simplify right side
   78,780.42x = 4,671,713,701.18
5. Step 5: Solve for x
   x = 4,671,713,701.18/78,780.42
6. Step 6: Final answer
   x = 59,300.44