Finding the Fourth Proportional to 100,479, 138,667.50 and 55,767

Step by Step Solution

1. Step 1: Write the proportion equation
   100,479 : 138,667.50 = 55,767 : x
2. Step 2: Convert to fraction form
   100,479/138,667.50 = 55,767/x
3. Step 3: Cross multiply
   100,479x = 138,667.50 × 55,767
4. Step 4: Simplify right side
   100,479x = 7,733,070,472.50
5. Step 5: Solve for x
   x = 7,733,070,472.50/100,479
6. Step 6: Final answer
   x = 76,962.06