Finding the Fourth Proportional to 428,005.56, 590,647.14 and 237,018.72

Step by Step Solution

1. Step 1: Write the proportion equation
   428,005.56 : 590,647.14 = 237,018.72 : x
2. Step 2: Convert to fraction form
   428,005.56/590,647.14 = 237,018.72/x
3. Step 3: Cross multiply
   428,005.56x = 590,647.14 × 237,018.72
4. Step 4: Simplify right side
   428,005.56x = 139,994,429,094.46
5. Step 5: Solve for x
   x = 139,994,429,094.46/428,005.56
6. Step 6: Final answer
   x = 327,085.54