Finding the Fourth Proportional to 105,077.37, 157,405.49 and 99,558.21

Step by Step Solution

1. Step 1: Write the proportion equation
   105,077.37 : 157,405.49 = 99,558.21 : x
2. Step 2: Convert to fraction form
   105,077.37/157,405.49 = 99,558.21/x
3. Step 3: Cross multiply
   105,077.37x = 157,405.49 × 99,558.21
4. Step 4: Simplify right side
   105,077.37x = 15,671,008,828.57
5. Step 5: Solve for x
   x = 15,671,008,828.57/105,077.37
6. Step 6: Final answer
   x = 149,137.81