Finding the Fourth Proportional to 100,443, 138,611.34 and 55,731

Step by Step Solution

1. Step 1: Write the proportion equation
   100,443 : 138,611.34 = 55,731 : x
2. Step 2: Convert to fraction form
   100,443/138,611.34 = 55,731/x
3. Step 3: Cross multiply
   100,443x = 138,611.34 × 55,731
4. Step 4: Simplify right side
   100,443x = 7,724,948,589.54
5. Step 5: Solve for x
   x = 7,724,948,589.54/100,443
6. Step 6: Final answer
   x = 76,908.78