Finding the Fourth Proportional to 530,499.61, 732,089.54 and 288,784.02

Step by Step Solution

1. Step 1: Write the proportion equation
   530,499.61 : 732,089.54 = 288,784.02 : x
2. Step 2: Convert to fraction form
   530,499.61/732,089.54 = 288,784.02/x
3. Step 3: Cross multiply
   530,499.61x = 732,089.54 × 288,784.02
4. Step 4: Simplify right side
   530,499.61x = 211,415,763,828.45
5. Step 5: Solve for x
   x = 211,415,763,828.45/530,499.61
6. Step 6: Final answer
   x = 398,522.00