Finding the Fourth Proportional to 1,058,799.81, 1,588,496.18 and 428,156.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,058,799.81 : 1,588,496.18 = 428,156.49 : x
2. Step 2: Convert to fraction form
   1,058,799.81/1,588,496.18 = 428,156.49/x
3. Step 3: Cross multiply
   1,058,799.81x = 1,588,496.18 × 428,156.49
4. Step 4: Simplify right side
   1,058,799.81x = 680,124,946,666.43
5. Step 5: Solve for x
   x = 680,124,946,666.43/1,058,799.81
6. Step 6: Final answer
   x = 642,354.62