Finding the Fourth Proportional to 139,656.42, 209,457.59 and 54,267.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,656.42 : 209,457.59 = 54,267.12 : x
2. Step 2: Convert to fraction form
   139,656.42/209,457.59 = 54,267.12/x
3. Step 3: Cross multiply
   139,656.42x = 209,457.59 × 54,267.12
4. Step 4: Simplify right side
   139,656.42x = 11,366,659,900.11
5. Step 5: Solve for x
   x = 11,366,659,900.11/139,656.42
6. Step 6: Final answer
   x = 81,390.17