Finding the Fourth Proportional to 648,111.70, 908,289.50 and 648,111.70

Step by Step Solution

1. Step 1: Write the proportion equation
   648,111.70 : 908,289.50 = 648,111.70 : x
2. Step 2: Convert to fraction form
   648,111.70/908,289.50 = 648,111.70/x
3. Step 3: Cross multiply
   648,111.70x = 908,289.50 × 648,111.70
4. Step 4: Simplify right side
   648,111.70x = 588,673,051,937.15
5. Step 5: Solve for x
   x = 588,673,051,937.15/648,111.70
6. Step 6: Final answer
   x = 908,289.50