Finding the Fourth Proportional to 139,714.19, 209,406.25 and 59,728.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,714.19 : 209,406.25 = 59,728.76 : x
2. Step 2: Convert to fraction form
   139,714.19/209,406.25 = 59,728.76/x
3. Step 3: Cross multiply
   139,714.19x = 209,406.25 × 59,728.76
4. Step 4: Simplify right side
   139,714.19x = 12,507,575,648.75
5. Step 5: Solve for x
   x = 12,507,575,648.75/139,714.19
6. Step 6: Final answer
   x = 89,522.59