Finding the Fourth Proportional to 390,061.30, 546,823.10 and 390,061.30

Step by Step Solution

1. Step 1: Write the proportion equation
   390,061.30 : 546,823.10 = 390,061.30 : x
2. Step 2: Convert to fraction form
   390,061.30/546,823.10 = 390,061.30/x
3. Step 3: Cross multiply
   390,061.30x = 546,823.10 × 390,061.30
4. Step 4: Simplify right side
   390,061.30x = 213,294,529,256.03
5. Step 5: Solve for x
   x = 213,294,529,256.03/390,061.30
6. Step 6: Final answer
   x = 546,823.10