Finding the Fourth Proportional to 530,112.60, 731,538.72 and 288,388.98

Step by Step Solution

1. Step 1: Write the proportion equation
   530,112.60 : 731,538.72 = 288,388.98 : x
2. Step 2: Convert to fraction form
   530,112.60/731,538.72 = 288,388.98/x
3. Step 3: Cross multiply
   530,112.60x = 731,538.72 × 288,388.98
4. Step 4: Simplify right side
   530,112.60x = 210,967,705,291.31
5. Step 5: Solve for x
   x = 210,967,705,291.31/530,112.60
6. Step 6: Final answer
   x = 397,967.72