Finding the Fourth Proportional to 316,345.84, 436,586.96 and 189,018.72

Step by Step Solution

1. Step 1: Write the proportion equation
   316,345.84 : 436,586.96 = 189,018.72 : x
2. Step 2: Convert to fraction form
   316,345.84/436,586.96 = 189,018.72/x
3. Step 3: Cross multiply
   316,345.84x = 436,586.96 × 189,018.72
4. Step 4: Simplify right side
   316,345.84x = 82,523,108,347.89
5. Step 5: Solve for x
   x = 82,523,108,347.89/316,345.84
6. Step 6: Final answer
   x = 260,863.58