Finding the Fourth Proportional to 1,283,789.61, 1,925,872.20 and 385,302.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,283,789.61 : 1,925,872.20 = 385,302.42 : x
2. Step 2: Convert to fraction form
   1,283,789.61/1,925,872.20 = 385,302.42/x
3. Step 3: Cross multiply
   1,283,789.61x = 1,925,872.20 × 385,302.42
4. Step 4: Simplify right side
   1,283,789.61x = 742,043,219,270.72
5. Step 5: Solve for x
   x = 742,043,219,270.72/1,283,789.61
6. Step 6: Final answer
   x = 578,009.99