Finding the Fourth Proportional to 812,139.01, 1,219,406.05 and 453,011.50

Step by Step Solution

1. Step 1: Write the proportion equation
   812,139.01 : 1,219,406.05 = 453,011.50 : x
2. Step 2: Convert to fraction form
   812,139.01/1,219,406.05 = 453,011.50/x
3. Step 3: Cross multiply
   812,139.01x = 1,219,406.05 × 453,011.50
4. Step 4: Simplify right side
   812,139.01x = 552,404,965,910.10
5. Step 5: Solve for x
   x = 552,404,965,910.10/812,139.01
6. Step 6: Final answer
   x = 680,185.24