Finding the Fourth Proportional to 100,364.72, 138,505.06 and 55,039.88

Step by Step Solution

1. Step 1: Write the proportion equation
   100,364.72 : 138,505.06 = 55,039.88 : x
2. Step 2: Convert to fraction form
   100,364.72/138,505.06 = 55,039.88/x
3. Step 3: Cross multiply
   100,364.72x = 138,505.06 × 55,039.88
4. Step 4: Simplify right side
   100,364.72x = 7,623,301,881.79
5. Step 5: Solve for x
   x = 7,623,301,881.79/100,364.72
6. Step 6: Final answer
   x = 75,955.99