Finding the Fourth Proportional to 120,199.95, 165,823.81 and 72,426.15

Step by Step Solution

1. Step 1: Write the proportion equation
   120,199.95 : 165,823.81 = 72,426.15 : x
2. Step 2: Convert to fraction form
   120,199.95/165,823.81 = 72,426.15/x
3. Step 3: Cross multiply
   120,199.95x = 165,823.81 × 72,426.15
4. Step 4: Simplify right side
   120,199.95x = 12,009,979,955.57
5. Step 5: Solve for x
   x = 12,009,979,955.57/120,199.95
6. Step 6: Final answer
   x = 99,916.68