Finding the Fourth Proportional to 100,445, 138,618.42 and 55,733

Step by Step Solution

1. Step 1: Write the proportion equation
   100,445 : 138,618.42 = 55,733 : x
2. Step 2: Convert to fraction form
   100,445/138,618.42 = 55,733/x
3. Step 3: Cross multiply
   100,445x = 138,618.42 × 55,733
4. Step 4: Simplify right side
   100,445x = 7,725,620,401.86
5. Step 5: Solve for x
   x = 7,725,620,401.86/100,445
6. Step 6: Final answer
   x = 76,913.94