Finding the Fourth Proportional to 139,468.50, 209,961.72 and 127,068.21

Step by Step Solution

1. Step 1: Write the proportion equation
   139,468.50 : 209,961.72 = 127,068.21 : x
2. Step 2: Convert to fraction form
   139,468.50/209,961.72 = 127,068.21/x
3. Step 3: Cross multiply
   139,468.50x = 209,961.72 × 127,068.21
4. Step 4: Simplify right side
   139,468.50x = 26,679,459,928.92
5. Step 5: Solve for x
   x = 26,679,459,928.92/139,468.50
6. Step 6: Final answer
   x = 191,293.80