Finding the Fourth Proportional to 648,870.28, 973,307.68 and 199,588.12

Step by Step Solution

1. Step 1: Write the proportion equation
   648,870.28 : 973,307.68 = 199,588.12 : x
2. Step 2: Convert to fraction form
   648,870.28/973,307.68 = 199,588.12/x
3. Step 3: Cross multiply
   648,870.28x = 973,307.68 × 199,588.12
4. Step 4: Simplify right side
   648,870.28x = 194,260,650,032.76
5. Step 5: Solve for x
   x = 194,260,650,032.76/648,870.28
6. Step 6: Final answer
   x = 299,382.88