Finding the Fourth Proportional to 648,678.91, 973,111.22 and 199,437.50

Step by Step Solution

1. Step 1: Write the proportion equation
   648,678.91 : 973,111.22 = 199,437.50 : x
2. Step 2: Convert to fraction form
   648,678.91/973,111.22 = 199,437.50/x
3. Step 3: Cross multiply
   648,678.91x = 973,111.22 × 199,437.50
4. Step 4: Simplify right side
   648,678.91x = 194,074,864,073.19
5. Step 5: Solve for x
   x = 194,074,864,073.19/648,678.91
6. Step 6: Final answer
   x = 299,184.79