Finding the Fourth Proportional to 78,781.67, 108,719.05 and 42,972.45

Step by Step Solution

1. Step 1: Write the proportion equation
   78,781.67 : 108,719.05 = 42,972.45 : x
2. Step 2: Convert to fraction form
   78,781.67/108,719.05 = 42,972.45/x
3. Step 3: Cross multiply
   78,781.67x = 108,719.05 × 42,972.45
4. Step 4: Simplify right side
   78,781.67x = 4,671,923,725.31
5. Step 5: Solve for x
   x = 4,671,923,725.31/78,781.67
6. Step 6: Final answer
   x = 59,302.17