Finding the Fourth Proportional to 72,989.81, 100,726.01 and 42,769.12

Step by Step Solution

1. Step 1: Write the proportion equation
   72,989.81 : 100,726.01 = 42,769.12 : x
2. Step 2: Convert to fraction form
   72,989.81/100,726.01 = 42,769.12/x
3. Step 3: Cross multiply
   72,989.81x = 100,726.01 × 42,769.12
4. Step 4: Simplify right side
   72,989.81x = 4,307,962,091.34
5. Step 5: Solve for x
   x = 4,307,962,091.34/72,989.81
6. Step 6: Final answer
   x = 59,021.42