Finding the Fourth Proportional to 918,859.86, 1,379,142.72 and 469,901.57

Step by Step Solution

1. Step 1: Write the proportion equation
   918,859.86 : 1,379,142.72 = 469,901.57 : x
2. Step 2: Convert to fraction form
   918,859.86/1,379,142.72 = 469,901.57/x
3. Step 3: Cross multiply
   918,859.86x = 1,379,142.72 × 469,901.57
4. Step 4: Simplify right side
   918,859.86x = 648,061,322,486.36
5. Step 5: Solve for x
   x = 648,061,322,486.36/918,859.86
6. Step 6: Final answer
   x = 705,288.53