Finding the Fourth Proportional to 390,025.87, 585,060.69 and 109,521.25

Step by Step Solution

1. Step 1: Write the proportion equation
   390,025.87 : 585,060.69 = 109,521.25 : x
2. Step 2: Convert to fraction form
   390,025.87/585,060.69 = 109,521.25/x
3. Step 3: Cross multiply
   390,025.87x = 585,060.69 × 109,521.25
4. Step 4: Simplify right side
   390,025.87x = 64,076,578,094.66
5. Step 5: Solve for x
   x = 64,076,578,094.66/390,025.87
6. Step 6: Final answer
   x = 164,288.02