Finding the Fourth Proportional to 812,840.72, 1,214,317.26 and 526,196.10

Step by Step Solution

1. Step 1: Write the proportion equation
   812,840.72 : 1,214,317.26 = 526,196.10 : x
2. Step 2: Convert to fraction form
   812,840.72/1,214,317.26 = 526,196.10/x
3. Step 3: Cross multiply
   812,840.72x = 1,214,317.26 × 526,196.10
4. Step 4: Simplify right side
   812,840.72x = 638,969,001,618.59
5. Step 5: Solve for x
   x = 638,969,001,618.59/812,840.72
6. Step 6: Final answer
   x = 786,093.74