Finding the Fourth Proportional to 100,443.30, 138,612.84 and 55,119.96

Step by Step Solution

1. Step 1: Write the proportion equation
   100,443.30 : 138,612.84 = 55,119.96 : x
2. Step 2: Convert to fraction form
   100,443.30/138,612.84 = 55,119.96/x
3. Step 3: Cross multiply
   100,443.30x = 138,612.84 × 55,119.96
4. Step 4: Simplify right side
   100,443.30x = 7,640,334,196.29
5. Step 5: Solve for x
   x = 7,640,334,196.29/100,443.30
6. Step 6: Final answer
   x = 76,066.14