Finding the Fourth Proportional to 78,749.20, 108,669.90 and 42,938.92

Step by Step Solution

1. Step 1: Write the proportion equation
   78,749.20 : 108,669.90 = 42,938.92 : x
2. Step 2: Convert to fraction form
   78,749.20/108,669.90 = 42,938.92/x
3. Step 3: Cross multiply
   78,749.20x = 108,669.90 × 42,938.92
4. Step 4: Simplify right side
   78,749.20x = 4,666,168,142.51
5. Step 5: Solve for x
   x = 4,666,168,142.51/78,749.20
6. Step 6: Final answer
   x = 59,253.53