Finding the Fourth Proportional to 105,061.51, 157,638.48 and 55,129.87

Step by Step Solution

1. Step 1: Write the proportion equation
   105,061.51 : 157,638.48 = 55,129.87 : x
2. Step 2: Convert to fraction form
   105,061.51/157,638.48 = 55,129.87/x
3. Step 3: Cross multiply
   105,061.51x = 157,638.48 × 55,129.87
4. Step 4: Simplify right side
   105,061.51x = 8,690,588,909.40
5. Step 5: Solve for x
   x = 8,690,588,909.40/105,061.51
6. Step 6: Final answer
   x = 82,719.06