Finding the Fourth Proportional to 390,158.56, 585,276.78 and 105,853.57

Step by Step Solution

1. Step 1: Write the proportion equation
   390,158.56 : 585,276.78 = 105,853.57 : x
2. Step 2: Convert to fraction form
   390,158.56/585,276.78 = 105,853.57/x
3. Step 3: Cross multiply
   390,158.56x = 585,276.78 × 105,853.57
4. Step 4: Simplify right side
   390,158.56x = 61,953,636,601.10
5. Step 5: Solve for x
   x = 61,953,636,601.10/390,158.56
6. Step 6: Final answer
   x = 158,790.92